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|
Outer diameter (mm) |
Thickness of pipe (mm) |
|
7.0 - 22 |
0.5 - 1.5 |
|
22.2 - 38 |
0.6 - 2.0 |
|
40 - 50 |
0.8 - 2.0 |
|
50.8 - 80 |
1.0 - 2.5 |
Index for outer diameter of round welded steel pipes
|
Index of outer diameter |
||||
|
GB/T13793-2008 |
Company internal control standards |
|||
|
(D) |
Normal |
High precision |
Higher precision |
Internal control accuracy |
|
5 - 20 |
±0.30 |
±0.20 |
±0.10 |
±0.05 |
|
21 - 30 |
±0.50 |
±0.30 |
±0.15 |
±0.05 |
|
31 - 40 |
±0.50 |
±0.30 |
±0.15 |
±0.08 |
|
41 - 50 |
±0.50 |
±0.30 |
±0.15 |
±0.10 |
|
51 - 80 |
±1.0%D |
±0.50 |
±0.30 |
±0.15 |
